Improved caster



ALEXANDER C. TWINING, OF NEW HAVEN, CONNECTICUT.

Letters Patent No. 74,019, dated February 4, 1868; antedateol January 8, 1868.

IMPROVED GASTER.

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Be it known that I, ALEXANDER C. TWINING, of' the city and county of New Haven, in the State of Con. ueotiout, have invented a new and improved'Caster; and I hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and'to the letters of reference marked thereon.

An ordinary caster consists essentially ofthe wheel which rolls upon a floor, ofthe carriage which supports upon. the Wheel the weight or burden for which the caster is provided, and of the socket or bed in which the pintle of the carriage enters an works. p I

My improvement consists in a particular way of' preventing the carriage from falling or coming out of the .bed when lifted or carried. For this I attach to the carriage a springvcatch that enters easily a groove orslot worked around the inside cavity of the socket or bed, but may be thrown out of it by the hand or finger when it is desired to disengage the catch and separate the carriage from the socket.

To show clearly the arrangement and construction, I describe the same by assistance ofthe accompanying drawings.' In these` Figure I is a side view of the wheel, the carriage, and the spring-catch.

Figure II is a. back or face View of the same.

Figure III, a side view, embracing the socket or bed and its groove or slot in section.

Figure IV, a ground view supplementary to Figs. I and II; and

Figure V, a side viewof the socket itself in surfaces and section.

The additional three figures are, VI a side view, VII a face or back view, and VIII a ground view of one of the equivalents that might be proposed to the construction shown by the first tive figures; all which will be understood by the correspondence of lettering, as well as of shading, with the rst figures, as herein explained, but which I do not esteem so advantageous an arrangement as the one now most particularly to be described.

In all the figures, w w w, &c., designatethe wheels; pp m10 p m m, lite., are the carriages, which name, cai-ringe, wherever-herein used, includes both the bearing m m and the pintleppp, 86o., while b b b b b, ttc., are the beds or sockets. The parts which constitute the improvements are the spring-catch, s c s', Figs. I, II, III, and s c, Fig. IV, attached to the carriage at the upper part of its pintle, and capable of' being pressed back, as in Fig. III, into a slot, o o, Fig. I, or o, Fig. IV; It carries the knob or pin c, Figs. I to IV, which is sprung out, Figs. I and IV, by s s', when the pintle isout of the-bed, but,'when the latleris slipped into place, enters the slot 2 z', Figs. III and V, and holds the carriage to the bed, but traversing freely around with the pintle; but, if you wish to detach the wheel and carriage, take hold of the same with the hand, and by a fingerl press es into o o, while you pull away the carriage from the bed. The attachment of the spring at s may be made by a rivet or by simply hammering down upon the spring the sides of thc slot o o, which atthat part receives the spring closely, but for the rest is a little wider than the spring. The catch e and slot z' z' may be made to incline a very little down toward the seat ci' the pintle in the carriage, so that by pulling and turning the carriage at one and the Same time, it will be detached, even without pressing or drawing s or s s otherwise. In the equivalent arrangement shown in Figs. VI to VIII, the'catch c or c c is fast to the spring, and passes in a drilled hole through the bearing and pintlc. In this case the spring is not neccssarilyiixed at either extremity, butmay be attached simply by bending it around either side of the carriage in thc recess o o, made for the purpose. It is easily understood how the finger-nail, catching s s at the middle, will draw back e c out of the slot it', Fig. VI, for the carriage to be pulled away from b b b.

I claim the spring-catch attached to the carriage, as described, in combination with the groove or slot around the interior of the socket, all substantially as described and for the purposes Set forth.

New Haven, .I une 5, 1867.

4 ALEX. C. TWINING. Witnesses:

WM. BAmNeron.

t HELEN T. MAGILL, 

